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Power Engineering 4th Class - Unit
B1 Review
R4B01-02-04-16 When grease is used in an antifriction bearing after cleaning, the bearing housing should not be filled _____ full. Select one: a. more than 1/ b. more than 1/ c. more than 3/ d. less than completely - โ โ a R4B01-02-02-08 A large journal bearing which is running hotter than normal can be cooled by: Select one: a. Direct application of cool water b. Loosening the bearing caps c. Decreasing the viscosity of the oil by cooling it d. Pumping additional grease into it - โ โ b R4B01-02-03-09 A collar thrust bearing: Select one: a. Can support more load than a Michell thrust bearing b. Is an anti-friction type bearing c. Is used with steam turbines only d. Has boundary lubrication - โ โ d
R4B01-02-04-17 When replacing or removing an anti-friction ball bearing, the applied force should: Select one: a. Not be transmitted through the bearing balls b. Always be against the inner race c. Always be against the outer race d. Be made only after heating the bearing - โ โ a R4B01-02-04-18 Using pressurized air to blow out a cleaned bearing: Select one: a. Should only be done in well-ventilated areas b. Must be done only while the bearing is hot c. Will cause the bearing to become "pitted" d. Should be done at an angle so the bearing can spin - โ โ c R4B01-01-02-05 Grease is not a suitable lubricant: Select one: a. If the atmosphere contains a lot of moisture b. When the atmosphere is dusty c. If corrosion protection is desired during downtime d. If a large amount of cooling is desired - โ โ d R4B01-01-02-06 Grease: Select one: a. Is a semi-liquid
R4B01-01-02-09 If ambient air temperatures are very low, the preferred lubricant is a: Select one: a. Solid b. Semi-solid c. Fixed oil d. Liquid - โ โ a R4B01-01-02-10 The cheapest and most commonly used grease is: Select one: a. Potassium base b. Chlorine base c. Lime base d. Sulphate base - โ โ c R4B01-01-02-11 The _____ number of oil indicates the acidity of oil. Select one: a. Acidity b. Alkalinity c. Neutralization d. Viscosity index - โ โ c R4B01-01-03-12 If an oil's viscosity changes a lot with very little temperature change, it will have a: Select one: a. Low viscosity index
b. High pour point c. High viscosity index d. Low pour point - โ โ a R4B01-01-03-13 Lubricants used for high-output steam turbines should: Select one: a. Have a very high viscosity b. Be fire resistant c. Have a low pour point d. Mix well with water - โ โ b R4B01-01-03-14 The oil for a refrigeration compressor must: Select one: a. Have a low pour point b. Have a high flash point c. Have a high fire point d. Be a multi-grade type - โ โ a R4B01-01-03-15 The point at which oil will give off enough vapour to ignite and burn continuously is known as the _____ point. Select one: a. Flash b. Ignition c. Fire d. Vaporization - โ โ c
a. Pressure b. Load c. Temperature d. Speed - โ โ c R4B01-01-03-20 The instrument that measures the viscosity of an oil at a certain temperature as it flows through a small diameter tube, is called: Select one: a. An orifice plate b. A Saybolt viscometer c. An oil meter d. A vena contracta - โ โ b R4B01-01-03-21 The resistance of a liquid to internal deformation or shear is known as: Select one: a. Pour point b. Viscosity index c. Flash point d. Viscosity - โ โ d R4B01-01-03-22 Air compressor oil should: Select one: a. Have a very low viscosity b. Have low carbon residue
c. Have a low flash point d. Not contain anti-oxidants - โ โ b R4B01-02-01-01 Fluid film lubrication: Select one: a. Eliminates all bearing friction b. Is different from flood lubrication c. Supports heavy loads d. Prevents wear during start-up - โ โ c R4B01-02-01-02 A form of lubrication that requires continual motion of a shaft or surface is: Select one: a. Boundary lubrication b. Continuous lubrication c. Forced lubrication d. Fluid film lubrication - โ โ d R4B01-02-02-03 Large journal or sleeve bearings have grooves: Select one: a. In the high pressure area of the bearing babbit b. Cut into the bearing housing c. For distributing lubricant evenly just after the pressure area d. In the non-pressure area - โ โ d R4B01-02-02-04 A journal bearing:
c. Consists of ball bearings in a shell d. Is used for heavy loads - โ โ d R4B01-01-01-01 Where gear teeth inter-mesh, a lubricant must provide Select one: a. Corrosion prevention b. Sealing c. Shock absorption d. Temperature control - โ โ c R4B01-01-02-03 The majority of lubricants are: Select one: a. Animal fats b. Synthetic oils c. Mineral oils d. Greases - โ โ c R4B01-01-02-04 The kind of grease used for heavily loaded machinery operating at slow speeds is the: Select one: a. Sodium base grease b. Specialty grease c. Calcium base grease d. Aluminum base grease - โ โ b
R4B01-02-05-21 A normal anti-friction bearing temperature operating range is: Select one: a. 150ยฐC to 160ยฐC b. 20ยฐC to 50ยฐC c. 65ยฐC to 70ยฐC d. 80ยฐC to 120ยฐC - โ โ c R4B01-02-05-21 Applying installation forces through the balls of a bearing can cause: Select one: a. Bearing misalignment b. Too large an air gap c. Cracking or breaking of the balls d. Brinelling - โ โ d R4B01-02-43-14 When inspecting a dismantled bearing, the first indication of a failing bearing is: Select one: a. Cracked balls b. Roughness c. Discoloration d. Rusting or corrosion e. Tapered rollers - โ โ b R4B01-02-03-10 A type of anti-friction bearing is the _____.
c. Has rolling friction d. Is a sleeve bearing - โ โ c R4B01-02-04-15 The proper way to store a bearing after cleaning is to dip it in __________________ and wrap it in grease-proof paper. Select one: a. A desiccant such as rice b. Wax c. Solvent d. A rust preventative - โ โ d R4B01-02-04-20 With antifriction bearings using grease, the bearings: Select one: a. Must be cleaned twice as often as oil-lubricated bearings b. Can be cleaned by adding solvent to the grease cartridge c. Are cleaned less often than oil-lubricated bearings d. Never require cleaning - โ โ c R4B01-02-05-19 A common cause of antifriction bearing failure is: Select one: a. High RPM service b. Extreme cold temperature cracking c. Drive motor overload d. Shaft misalignment - โ โ d
